I have also registered myself through udaan.bsnl.co.in in the same you registered but from that day to today, I didn't receive any call.
I had raised 3 request for 3 diff product. For wimax, Broadband and FTTH.
You may get call. It normally depends on circle. I called on received number but no one responded.
Ohhh, even BSNL sends SMS now a days, never thought that they know what is customer service admin will have to face a tough time with the installation as its BSNLOnce the connection is up its the most stable connection in whole Hyd atleast